Posted on 2013-03-07 19:03:17 network
最近在折腾一个长连接HTTP服务器的时候，积累了一些经验，下面总结出来:
最好使用支持HTTP/1.1的服务器，HTTP/1.1默认支持keep-alive，不需要像HTTP/1.0那样检测Connection: keep-alive.
浏览器的刷新也会断开长连接，如果在服务端有一些判断，要注意发生重复的可能。
在用户关闭浏览器的标签的时候，如果有多个页面和服务器保持长连接，服务器应检测对应的页面，并做清理。
将长连接服务器位于反向代理之后，应在反向代理服务器上设置保持keep-alive，如nginx。 这样可显著减少后端upstream服务器的压力。
检测用户刷新页面，如果刷新应询问用户是否真的刷新。这样可以减少一些误判断。 如WEBQQ在检测到用户刷新时，对应的动作是重新登录。 这样做是很好，可以预防用户在当前页面重复触发一些业务逻辑。
如因为业务需要将长连接和会话绑定（很多WEB IM都这样做），应注意清理服务端保持的长连接。 发送完消息，就应该删除这个长连接。因为浏览器ajax请求还会立即请求的。
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